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How to Use: 1. Zoom in: put the original drawing under (2) guide pen, put the drawing (white paper) under (3) brush, hold the brush, move with the original drawing, and the original drawing can be zoomed in on the drawing. 2. Reduce: Exchange (2) guide pen and (3) drawing pen, and adjust the position of the original drawing and the drawing, so that the original drawing can be reduced. 3. Move screw a and screw B and (2) guide pen to the applicable position to get the required magnification pattern. (the dotted line of the platform drawing indicates that, and so on, the magnification patterns marked on the ruler can be obtained.). Package Size: 380 * 120 * 50mm Weight: 0.19kg